[CLANG][PATCH][FPEnv] Add support for option -ffp-eval-method and extend #pragma float_control similarly

Need to update a clang regression test for VE after
https://reviews.llvm.org/D93769.

Reviewed By: simoll

Differential Revision: https://reviews.llvm.org/D108069

clang/test/Preprocessor/init-ve.c

@@ -32,7 +32,6 @@
 // VE:#define __FLT_DENORM_MIN__ 1.40129846e-45F
 // VE:#define __FLT_DIG__ 6
 // VE:#define __FLT_EPSILON__ 1.19209290e-7F
-// VE:#define __FLT_EVAL_METHOD__ 0
 // VE:#define __FLT_HAS_DENORM__ 1
 // VE:#define __FLT_HAS_INFINITY__ 1
 // VE:#define __FLT_HAS_QUIET_NAN__ 1