Update comments

Author: thurstond

llvm/lib/Transforms/Instrumentation/MemorySanitizer.cpp

@@ -5385,6 +5385,8 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
       break;
     }
 
+    // Convert Packed Double Precision Floating-Point Values
+    //   to Packed Single PrecisionFloating-Point Values
     case Intrinsic::x86_sse2_cvtpd2ps:
     case Intrinsic::x86_sse2_cvtps2dq:
     case Intrinsic::x86_sse2_cvtpd2dq:
@@ -5399,6 +5401,7 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
       break;
     }
 
+    // Shift Packed Data (Left Logical, Right Arithmetic, Right Logical)
     case Intrinsic::x86_avx512_psll_w_512:
     case Intrinsic::x86_avx512_psll_d_512:
     case Intrinsic::x86_avx512_psll_q_512:
@@ -5966,7 +5969,7 @@ struct MemorySanitizerVisitor : public InstVisitor<MemorySanitizerVisitor> {
       break;
 
     // Convert Packed Single Precision Floating-Point Values
-    //   to Packed SignedDoubleword Integer Values
+    //   to Packed Signed Doubleword Integer Values
     //
     // <16 x i32> @llvm.x86.avx512.mask.cvtps2dq.512
     //                (<16 x float>, <16 x i32>, i16, i32)