Tests for additional builtin classification functions

[spavloff]

This change adds tests for functions 'iszero', 'issubnornal' and 'issignaling'. It also adds tests for Intel fp80 type and some other small enhancements.

Migrated from: https://reviews.llvm.org/D112933

[DavidSpickett]

Hi, one of these tests is failing on Arm and AArch64 with errors like:

cd /home/tcwg-buildbot/worker/clang-aarch64-global-isel/test/sandbox/build/SingleSource/UnitTests && /home/tcwg-buildbot/worker/clang-aarch64-global-isel/stage1.install/bin/llvm-size --format=sysv /home/tcwg-buildbot/worker/clang-aarch64-global-isel/test/sandbox/build/SingleSource/UnitTests/testcase-CGExprConstant > /home/tcwg-buildbot/worker/clang-aarch64-global-isel/test/sandbox/build/SingleSource/UnitTests/testcase-CGExprConstant.size
      |   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~
   38 |               (value))
      |               ~~~~~~~~
/home/tcwg-buildbot/worker/clang-aarch64-global-isel/test/test-suite/SingleSource/UnitTests/Float/test_isfpclass.h:28:11: note: expanded from macro 'CHECK_CLASS'
   28 |     if (!(cond)) {                                                             \
      |           ^~~~
/home/tcwg-buildbot/worker/clang-aarch64-global-isel/test/test-suite/SingleSource/UnitTests/Float/test_isfpclass.h:58:3: error: floating point classification requires argument of floating point type (passed in 'int')
   58 |   CHECK(fcFinite, x);
      |   ^~~~~~~~~~~~~~~~~~
/home/tcwg-buildbot/worker/clang-aarch64-global-isel/test/test-suite/SingleSource/UnitTests/Float/test_isfpclass.h:37:60: note: expanded from macro 'CHECK'
   37 |   CHECK_CLASS(!!((flags)&FPCLASS) == !!__builtin_isfpclass((flags), (value)),  \
      |   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~
   38 |               (value))
      |               ~~~~~~~~
/home/tcwg-buildbot/worker/clang-aarch64-global-isel/test/test-suite/SingleSource/UnitTests/Float/test_isfpclass.h:28:11: note: expanded from macro 'CHECK_CLASS'
   28 |     if (!(cond)) {                                                             \
      |           ^~~~
/home/tcwg-buildbot/worker/clang-aarch64-global-isel/test/test-suite/SingleSource/UnitTests/Float/test_isfpclass.h:60:3: error: floating point classification requires argument of floating point type (passed in 'int')
   60 |   CHECK(fcQNan | fcInf | fcNormal | fcSubnormal | fcZero, x);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/home/tcwg-buildbot/worker/clang-aarch64-global-isel/test/test-suite/SingleSource/UnitTests/Float/test_isfpclass.h:37:60: note: expanded from macro 'CHECK'
   37 |   CHECK_CLASS(!!((flags)&FPCLASS) == !!__builtin_isfpclass((flags), (value)),  \
      |   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~
   38 |               (value))
      |               ~~~~~~~~
/home/tcwg-buildbot/worker/clang-aarch64-global-isel/test/test-suite/SingleSource/UnitTests/Float/test_isfpclass.h:28:11: note: expanded from macro 'CHECK_CLASS'
   28 |     if (!(cond)) {                                                             \
      |           ^~~~

https://lab.llvm.org/buildbot/#/builders/183/builds/18017
https://lab.llvm.org/buildbot/#/builders/186/builds/13698

Your change is included but not listed as a change because buildbot only lists changes from the triggering repository, which is llvm-project in this case.

[spavloff]

While this patch was reviewed, __builtin_isfpclass changed signature, it caused the fail. Corrected patch was committed in 249c7ac.