carry some upstream patches to musl to fix riscv inline asm

Upstream commits:
 * 8eb49e0485fc547eead9e47200bbee6d81f391c1
 * 2dcbeabd917e404a0dde0195388da401b849b9a4
 * f0eb2e77b2132a88e2f00d8e06ffa7638c40b4bc

These will be in the next version of musl, so no harm carrying them
here.
04ce5376a8Andrew Kelley committed on 7/18/2019, 3:43:39 PMparentaaa4bf7
2 files changedLine totals unavailable