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Recommit "[DSE] Switch to MemorySSA-backed DSE by default."

Authored by fhahn on Oct 16 2020, 12:42 AM.

Description

Recommit "[DSE] Switch to MemorySSA-backed DSE by default."

After investigation by @asbirlea, the issue that caused the
revert appears to be an issue in the original source, rather
than a problem with the compiler.

This patch enables MemorySSA DSE again.

This reverts commit 915310bf14cbac58a81fd60e0fa9dc8d341108e2.