Disable strict-fp for powerpcspe, as it does not work properly yet

Merge commit 5c18d1136665 from llvm git (by Qiu Chaofan)

  [SPE] Disable strict-fp for SPE by default

  As discussed in PR50385, strict-fp on PowerPC SPE has not been
  handled well. This patch disables it by default for SPE.

  Reviewed By: nemanjai, vit9696, jhibbits

  Differential Revision: https://reviews.llvm.org/D103235

PR:		255570
MFC after:	6 weeks

contrib/llvm-project/clang/lib/Basic/Targets/PPC.cpp

@@ -57,6 +57,7 @@ bool PPCTargetInfo::handleTargetFeatures(std::vector<std::string> &Features,
     } else if (Feature == "+pcrelative-memops") {
       HasPCRelativeMemops = true;
     } else if (Feature == "+spe" || Feature == "+efpu2") {
+      HasStrictFP = false;
       HasSPE = true;
       LongDoubleWidth = LongDoubleAlign = 64;
       LongDoubleFormat = &llvm::APFloat::IEEEdouble();