[LoongArch] Emit function call code sequence as `PCADDU18I+JIRL` in medium code model

According to the description of the psABI v2.20:
https://github.com/loongson/la-abi-specs/releases/tag/v2.20, ad

[LoongArch] Emit function call code sequence as `PCADDU18I+JIRL` in medium code model

According to the description of the psABI v2.20:
https://github.com/loongson/la-abi-specs/releases/tag/v2.20, adjustments
are made to the function call instructions under the medium code model.

At the same time, AsmParser has already supported parsing the call36 and
tail36 macro instructions.

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[LoongArch] Add relax feature and keep relocations (#72191)

Add relax feature. To support linker relocation, we should make
relocation with a symbol rather than section plus offset, and keep all
r

[LoongArch] Add relax feature and keep relocations (#72191)

Add relax feature. To support linker relocation, we should make
relocation with a symbol rather than section plus offset, and keep all
relocations with non-abs symbol.

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[LoongArch] Emit R_LARCH_64_PCREL relocation for FK_Data_8 when IsPCRel is true

Reviewed By: xen0n, MaskRay, hev

Differential Revision: https://reviews.llvm.org/D153872

[MC][LoongArch] Fix needsRelocateWithSymbol() implementation

LoongArch should be `section plus offset`, so use the generic implementation
of `llvm/lib/MC/MCELFObjectTargetWriter.cpp` to return `fals

[MC][LoongArch] Fix needsRelocateWithSymbol() implementation

LoongArch should be `section plus offset`, so use the generic implementation
of `llvm/lib/MC/MCELFObjectTargetWriter.cpp` to return `false` directly, like
x86 and aarch64.

```
$ cat test.c
static int __attribute__((section(".text.another"))) test(int a, int b)
{
return a + b;
}
static int a = 1, b = 2;

int foo()
{
test(a, b);
return 0;
}

$ gcc -c test.c
$ readelf -Wr test.o

Relocation section '.rela.text' at offset 0x2a0 contains 5 entries:
Offset Info Type Symbol's Value Symbol's Name + Addend
0000000000000010 0000000300000047 R_LARCH_PCALA_HI20 0000000000000000 .data + 0
0000000000000014 0000000300000048 R_LARCH_PCALA_LO12 0000000000000000 .data + 0
0000000000000018 0000000300000047 R_LARCH_PCALA_HI20 0000000000000000 .data + 4
000000000000001c 0000000300000048 R_LARCH_PCALA_LO12 0000000000000000 .data + 4
0000000000000028 0000000500000042 R_LARCH_B26 0000000000000000 .text.another + 0

Relocation section '.rela.eh_frame' at offset 0x318 contains 2 entries:
Offset Info Type Symbol's Value Symbol's Name + Addend
000000000000001c 0000000500000063 R_LARCH_32_PCREL 0000000000000000 .text.another + 0
000000000000003c 0000000200000063 R_LARCH_32_PCREL 0000000000000000 .text + 0
```

Reviewed By: SixWeining, MaskRay

Differential Revision: https://reviews.llvm.org/D137384

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[LoongArch] Produce a R_LARCH_32_PCREL relocation

LoongArchELFObjectWriter::getRelocType check IsPCRel for FK_Data_4
(which we produce a R_LARCH_32_PCREL relocation for if IsPCRel).

R_LARCH_32_PCRE

[LoongArch] Produce a R_LARCH_32_PCREL relocation

LoongArchELFObjectWriter::getRelocType check IsPCRel for FK_Data_4
(which we produce a R_LARCH_32_PCREL relocation for if IsPCRel).

R_LARCH_32_PCREL is required for FDE relocation.

Differential Revision: https://reviews.llvm.org/D134715

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[LoongArch] Add more fixups and relocations

This patch makes the assembler support all modifiers defined in gnu-as.
Also changes some diagnostic information.

Differential Revision: https://reviews.

[LoongArch] Add more fixups and relocations

This patch makes the assembler support all modifiers defined in gnu-as.
Also changes some diagnostic information.

Differential Revision: https://reviews.llvm.org/D132633

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[LoongArch] Add some fixups and relocations

This patch only add %pc_hi20/%pc_lo12/%plt relocations in order
to be able to generate gnu ld linkable relocation file for the
`hello world` IR :
```
@.st

[LoongArch] Add some fixups and relocations

This patch only add %pc_hi20/%pc_lo12/%plt relocations in order
to be able to generate gnu ld linkable relocation file for the
`hello world` IR :
```
@.str = private unnamed_addr constant [14 x i8] c"Hello world!\0A\00", align 1

define dso_local signext i32 @main() nounwind {
entry:
%call = call signext i32 (ptr, ...) @printf(ptr noundef @.str)
ret i32 0
}

declare dso_local signext i32 @printf(ptr noundef, ...)
```

This patch also updates some test cases due to new modifiers introduced.
New test: test/MC/LoongArch/Relocations/relocations.s

Differential Revision: https://reviews.llvm.org/D132108

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[LoongArch] Use `end namespace xxx` style comment. NFC

[LoongArch] Fix several Clang warnings. NFC

[LoongArch 4/6] Add basic tablegen infra for LoongArch

This patch introduces basic tablegen infra such as
LoongArch{InstrFormats,InstrInfo,RegisterInfo,CallingConv,}.td.

For now, only add instructi

[LoongArch 4/6] Add basic tablegen infra for LoongArch

This patch introduces basic tablegen infra such as
LoongArch{InstrFormats,InstrInfo,RegisterInfo,CallingConv,}.td.

For now, only add instruction definitions for LoongArch basic integer
operations.
Our initial target is a working MC layer rather than codegen,
so appropriate SelectionDAG patterns will come later.

Differential revision: https://reviews.llvm.org/D115861

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