PPC: [crankshaft] Address the deoptimization loops of Math.floor, Math.round and Math.ceil.

src/crankshaft/hydrogen-instructions.h

Index: src/crankshaft/hydrogen-instructions.h
diff --git a/src/crankshaft/hydrogen-instructions.h b/src/crankshaft/hydrogen-instructions.h
index 196a14fc705533c86e6cbf1ccf1ae10941606ee4..d4c36d8625d8a0627234547ad069e34b1b5e542a 100644
--- a/src/crankshaft/hydrogen-instructions.h
+++ b/src/crankshaft/hydrogen-instructions.h
@@ -2498,7 +2498,7 @@ class HUnaryMathOperation final : public HTemplateInstruction<2> {
   // Indicates if we support a double (and int32) output for Math.floor and
   // Math.round.
   bool SupportsFlexibleFloorAndRound() const {
-#if V8_TARGET_ARCH_ARM64
+#if V8_TARGET_ARCH_ARM64 || V8_TARGET_ARCH_PPC
     return true;
 #elif V8_TARGET_ARCH_IA32 || V8_TARGET_ARCH_X64
     return CpuFeatures::IsSupported(SSE4_1);