[flang] Modifications to ieee floating point environment procedures (#121949)

Intrinsic module procedures ieee_get_modes, ieee_set_modes,
ieee_get_status, and ieee_set_status store and retrieve opa

[flang] Modifications to ieee floating point environment procedures (#121949)

Intrinsic module procedures ieee_get_modes, ieee_set_modes,
ieee_get_status, and ieee_set_status store and retrieve opaque data
values whose size varies by machine and OS environment. These data
values are usually, but not always small. Their sizes are not directly
known in a cross compilation environment. Address this issue by
implementing two mechanisms for processing these data values.
Environments that use typical small data sizes can access storage
defined at compile time. When this is not valid, data storage of any
size can be allocated at runtime.

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[flang] Add UNSIGNED (#113504)

Implement the UNSIGNED extension type and operations under control of a
language feature flag (-funsigned).

This is nearly identical to the UNSIGNED feature that h

[flang] Add UNSIGNED (#113504)

Implement the UNSIGNED extension type and operations under control of a
language feature flag (-funsigned).

This is nearly identical to the UNSIGNED feature that has been available
in Sun Fortran for years, and now implemented in GNU Fortran for
gfortran 15, and proposed for ISO standardization in J3/24-116.txt.

See the new documentation for details; but in short, this is C's
unsigned type, with guaranteed modular arithmetic for +, -, and *, and
the related transformational intrinsic functions SUM & al.

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[flang] IEEE_GET_UNDERFLOW_MODE, IEEE_SET_UNDERFLOW_MODE (#118551)

Implement IEEE_GET_UNDERFLOW_MODE and IEEE_SET_UNDERFLOW_MODE. Update
IEEE_SUPPORT_UNDERFLOW_CONTROL to enable support for indvidu

[flang] IEEE_GET_UNDERFLOW_MODE, IEEE_SET_UNDERFLOW_MODE (#118551)

Implement IEEE_GET_UNDERFLOW_MODE and IEEE_SET_UNDERFLOW_MODE. Update
IEEE_SUPPORT_UNDERFLOW_CONTROL to enable support for indvidual REAL
kinds.

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[flang] Support SELECTED_LOGICAL_KIND() up to lowering

Process and fold the new F'2023 intrinsic function SELECTED_LOGICAL_KIND.

Differential Revision: https://reviews.llvm.org/D159039

[flang] Add PowerPC vec_add, vec_and, vec_mul, vec_sub and vec_xor intrinsics

Differential Revision: https://reviews.llvm.org/D151857

[flang] Make real type of kind 10 target dependent

The real(10) is supported on x86_64. On aarch64, the value of
selected_real_kind(16) should be 16 rather than 10 since real(10)
is not supported on

[flang] Make real type of kind 10 target dependent

The real(10) is supported on x86_64. On aarch64, the value of
selected_real_kind(16) should be 16 rather than 10 since real(10)
is not supported on x86_64. Previously, the real type support check
is not target dependent. Support it now through the target triple
information.

Reviewed By: clementval

Differential Revision: https://reviews.llvm.org/D134021

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Revert "[flang] Make real type of kind 10 target dependent"

This reverts commit d11e406e369fc90be5e2e2a0798ea7b7d2625882.

[flang] Make real type of kind 10 target dependent

The real(10) is supported on x86_64. On aarch64, the value of
selected_real_kind(16) should be 16 rather than 10 since real(10)
is not supported on

[flang] Make real type of kind 10 target dependent

The real(10) is supported on x86_64. On aarch64, the value of
selected_real_kind(16) should be 16 rather than 10 since real(10)
is not supported on x86_64. Previously, the real type support check
is not target dependent. Support it now through the target triple
information.

Reviewed By: clementval

Differential Revision: https://reviews.llvm.org/D134021

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[flang] Establish a single source of target information for semantics

Create a TargetCharacteristics class to centralize the few items of
target specific information that are relevant to semantics.

[flang] Establish a single source of target information for semantics

Create a TargetCharacteristics class to centralize the few items of
target specific information that are relevant to semantics. Use the
new class for all target queries, including derived type component layout
modeling.

Future work will initialize this class with target information
provided or forwarded by the drivers, and use it to fold layout-dependent
intrinsic functions like TRANSFER().

Differential Revision: https://reviews.llvm.org/D129018

Updates: Attempts to work around build issues on Windows.

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