[BOLT][DWARF][NFC] Added double escape characters (#93348)

Added double escape characters to lines that describe a test.

[BOLT][TEST] Use double dash flags in tests

Replace a single dash with a double dash for options that have more
than a single letter.

llvm-bolt-wrapper.py has special treatment for output options s

[BOLT][TEST] Use double dash flags in tests

Replace a single dash with a double dash for options that have more
than a single letter.

llvm-bolt-wrapper.py has special treatment for output options such as
"-o" and "-w" causing issues when a single dash is used, e.g. for
"-write-dwp". The wrapper can be fixed as well, but using a double dash
has other advantages as well.

Reviewed By: rafauler

Differential Revision: https://reviews.llvm.org/D127538

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[BOLT][TEST] Replace cache+ option with ext-tsp

Replace "cache+" with "ext-tsp" in all BOLT tests

Test Plan:
```
ninja check-bolt
grep -rnw . -e "cache+"
```
no more tests containing "cache+"
"cach

[BOLT][TEST] Replace cache+ option with ext-tsp

Replace "cache+" with "ext-tsp" in all BOLT tests

Test Plan:
```
ninja check-bolt
grep -rnw . -e "cache+"
```
no more tests containing "cache+"
"cache+" and "ext-tsp" are aliases

Reviewed By: rafauler

Differential Revision: https://reviews.llvm.org/D126714

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[BOLT][test] Fix X86 cross-platform tests

Use target-specific flags for building X86 non-runnable tests.

Reviewed By: Amir

Differential Revision: https://reviews.llvm.org/D123072

[BOLT] Avoid pointless loop rotation

It seems the earlier implementation does not follow the description
in LoopRotationPass.h: It rotates loops even if they are already laid out
correctly. The diff

[BOLT] Avoid pointless loop rotation

It seems the earlier implementation does not follow the description
in LoopRotationPass.h: It rotates loops even if they are already laid out
correctly. The diff adjusts the behaviour.

Given that the impact of LoopInversionPass is minor, this change won't
yield significant perf differences. Tested on clang-10: there seems to be a
0.1%-0.3% cpu win and a small reduction of branch misses.

**Before:**
BOLT-INFO: 120 Functions were reordered by LoopInversionPass

**After:**
BOLT-INFO: 79 Functions were reordered by LoopInversionPass

Reviewed By: yota9

Differential Revision: https://reviews.llvm.org/D121921

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[BOLT][TEST] Remove dependence on host_cc and host_cxx

Summary: Add dependency on clang and clangxx instead.

(cherry picked from FBD31128140)

[PR] Introduce loop inversion pass

Summary:
This patch introduces LoopInversionPass. Its main purpose is to ensure
that the loop layout is optimal depending on the profile information. So
if profile

[PR] Introduce loop inversion pass

Summary:
This patch introduces LoopInversionPass. Its main purpose is to ensure
that the loop layout is optimal depending on the profile information. So
if profile information shows that the loop is used, the unconditional
jump instruction must be executed only once and vice-versa. Please take
a look to the pass header file and test for more details.

Also change link_fdata script a bit, to be able to change FDATA prefix,
like FileCheck does.

Vladislav Khmelevsky,
Advanced Software Technology Lab, Huawei

PR facebookincubator/BOLT#153

(cherry picked from FBD28391811)

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