Bug: http://b/157914307
This pragma enables
- -frounding-math, i.e. rounding mode set at runtime are honored
- -ffp-exception-behavior=strict, i.e. FPE semantics are preserved.
- Prevents use of FMA instructions.
Test: Build toolchain without revert https://r.android.com/1298100
and run bionic-unit-tests.math_h*
Change-Id: I6249b20c93e0fd4ebbdfbe433da4ad4a65d3747b
