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/scheduler_arm64.h b/compiler/optimizing/scheduler_arm64.h
index e1a80ec..63d5b7d 100644
--- a/compiler/optimizing/scheduler_arm64.h
+++ b/compiler/optimizing/scheduler_arm64.h
@@ -83,8 +83,8 @@
   M(SuspendCheck         , unused)                   \
   M(TypeConversion       , unused)                   \
   M(VecReplicateScalar   , unused)                   \
-  M(VecExtractScalar     , unused)                   \
-  M(VecReduce            , unused)                   \
+  M(VecSetScalars        , unused)                   \
+  M(VecSumReduce         , unused)                   \
   M(VecCnv               , unused)                   \
   M(VecNeg               , unused)                   \
   M(VecAbs               , unused)                   \
@@ -103,7 +103,6 @@
   M(VecShl               , unused)                   \
   M(VecShr               , unused)                   \
   M(VecUShr              , unused)                   \
-  M(VecSetScalars        , unused)                   \
   M(VecMultiplyAccumulate, unused)                   \
   M(VecLoad              , unused)                   \
   M(VecStore             , unused)