Revert "Implement Dot Product Vectorization for x86"

This reverts commit 4b7caeee57767f6bce7bb138a1299c0ae84bebf9.

Reason for revert: Test failure in jit-gcstress mode.
+Exception in thread "main" java.lang.Error: Expected: 131072, found: 0
+ at other.TestCharShort.expectEquals(TestCharShort.java:474)
+ at other.TestCharShort.testDotProd(TestCharShort.java:486)
+ at other.TestCharShort.run(TestCharShort.java:525)
+ at Main.main(Main.java:28)

Change-Id: I251cf666e8335499d227910987b2d49629c3f53d
11 files changed