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Revert "[FPEnv][X86] Platform-specific builtin constrained FP enablement"

Authored by kpn on Feb 6 2020, 3:58 PM.

Description

Revert "[FPEnv][X86] Platform-specific builtin constrained FP enablement"

This reverts commit 208470dd5d0a46bc3c24b66489b687eda4954262.

Tests fail:
error: unable to create target: 'No available targets are compatible with triple "x86_64-apple-darwin"'

This happens on clang-hexagon-elf, clang-cmake-armv7-quick, and
clang-cmake-armv7-quick bots.

If anyone has any suggestions on why then I'm all ears.

Differential Revision: https://reviews.llvm.org/D73570

Revert "[FPEnv][X86] Speculative fix for failures introduced by eda495426."

This reverts commit 80e17e5fcc09dc5baa940022e6988fcb08c5d92d.

The speculative fix didn't solve the test failures on Hexagon, ARMv6, and
MSVC AArch64.