Revert "Basic SIMD reduction support."

Fails 530-checker-lse on arm64.

Bug: 64091002, 65212948

This reverts commit cfa59b49cde265dc5329a7e6956445f9f7a75f15.

Change-Id: Icb5d6c805516db0a1d911c3ede9a246ccef89a22
diff --git a/compiler/optimizing/nodes.h b/compiler/optimizing/nodes.h
index 869fdd4..f60d532 100644
--- a/compiler/optimizing/nodes.h
+++ b/compiler/optimizing/nodes.h
@@ -1374,8 +1374,7 @@
   M(UShr, BinaryOperation)                                              \
   M(Xor, BinaryOperation)                                               \
   M(VecReplicateScalar, VecUnaryOperation)                              \
-  M(VecExtractScalar, VecUnaryOperation)                                \
-  M(VecReduce, VecUnaryOperation)                                       \
+  M(VecSumReduce, VecUnaryOperation)                                    \
   M(VecCnv, VecUnaryOperation)                                          \
   M(VecNeg, VecUnaryOperation)                                          \
   M(VecAbs, VecUnaryOperation)                                          \
@@ -7031,17 +7030,6 @@
   return false;
 }
 
-// Returns true iff instruction is the given integral constant.
-inline bool IsInt64Value(HInstruction* instruction, int64_t value) {
-  int64_t val = 0;
-  return IsInt64AndGet(instruction, &val) && val == value;
-}
-
-// Returns true iff instruction is a zero bit pattern.
-inline bool IsZeroBitPattern(HInstruction* instruction) {
-  return instruction->IsConstant() && instruction->AsConstant()->IsZeroBitPattern();
-}
-
 #define INSTRUCTION_TYPE_CHECK(type, super)                                    \
   inline bool HInstruction::Is##type() const { return GetKind() == k##type; }  \
   inline const H##type* HInstruction::As##type() const {                       \