Add several SIMD opcodes to IA32

src/ia32/macro-assembler-ia32.cc

Index: src/ia32/macro-assembler-ia32.cc
diff --git a/src/ia32/macro-assembler-ia32.cc b/src/ia32/macro-assembler-ia32.cc
index 9f8620194fa5d2325e1719a58718a2efc4e3f2d6..9dd4b5d460326b320280b01622fc8db4d64858c6 100644
--- a/src/ia32/macro-assembler-ia32.cc
+++ b/src/ia32/macro-assembler-ia32.cc
@@ -2278,19 +2278,18 @@ void MacroAssembler::Pextrd(Register dst, XMMRegister src, int8_t imm8) {
     movd(dst, src);
     return;
   }
-  DCHECK_EQ(1, imm8);
   if (CpuFeatures::IsSupported(SSE4_1)) {
     CpuFeatureScope sse_scope(this, SSE4_1);
     pextrd(dst, src, imm8);
     return;
   }
+  DCHECK_EQ(1, imm8);
   pshufd(xmm0, src, 1);
   movd(dst, xmm0);
 }
 
 
 void MacroAssembler::Pinsrd(XMMRegister dst, const Operand& src, int8_t imm8) {
-  DCHECK(imm8 == 0 || imm8 == 1);
   if (CpuFeatures::IsSupported(SSE4_1)) {
     CpuFeatureScope sse_scope(this, SSE4_1);
     pinsrd(dst, src, imm8);