[clang] [clang] Add support for -fcx-limited-range and #pragma CX_LIMITED_RANGE. (PR #68820)

[Joshua Cranmer via cfe-commits]

================
@@ -28,4 +28,6 @@ OPTION(FPEvalMethod, LangOptions::FPEvalMethodKind, 2, AllowApproxFunc)
 OPTION(Float16ExcessPrecision, LangOptions::ExcessPrecisionKind, 2, FPEvalMethod)
 OPTION(BFloat16ExcessPrecision, LangOptions::ExcessPrecisionKind, 2, Float16ExcessPrecision)
 OPTION(MathErrno, bool, 1, BFloat16ExcessPrecision)
+OPTION(CxLimitedRange, bool, 1, MathErrno)
+OPTION(CxFortranRules, bool, 1, CxLimitedRange)
----------------
jcranmer-intel wrote:

I'd recommend this be seen as a single, ternary enum (ComplexRange, which can be full, fortran, or limited) rather than a pair of boolean options.

https://github.com/llvm/llvm-project/pull/68820