PPC: [turbofan] Add new Float32Abs and Float64Abs operators.

src/compiler/ppc/code-generator-ppc.cc

Index: src/compiler/ppc/code-generator-ppc.cc
diff --git a/src/compiler/ppc/code-generator-ppc.cc b/src/compiler/ppc/code-generator-ppc.cc
index b421f694c8c520190d0250e45e83304e4270ba7a..8644c36941776acc47c62446a25b9a00c4697016 100644
--- a/src/compiler/ppc/code-generator-ppc.cc
+++ b/src/compiler/ppc/code-generator-ppc.cc
@@ -857,6 +857,9 @@ void CodeGenerator::AssembleArchInstruction(Instruction* instr) {
     case kPPC_MinDouble:
       ASSEMBLE_FLOAT_MIN(kScratchDoubleReg);
       break;
+    case kPPC_AbsDouble:
+      ASSEMBLE_FLOAT_UNOP_RC(fabs);
+      break;
     case kPPC_SqrtDouble:
       ASSEMBLE_FLOAT_UNOP_RC(fsqrt);
       break;