Instead, use x15 which is one of the available temporary registers.
Bug: 112907825
Test: test-pixelflinger-arm64-t32cb16blend
Change-Id: Icfcaae1d8163880eddc2862af92e5636a03d8b52
* Explicitly specify default .align 0.
* Use standard ldmfdlo instruction.
* Before and after gas outputs are identical,
with align 0 sections.
* Objdump showed .text/.data/.bss section alignment
attributes are 2^0 from gas and 2^2 from llvm
assembler. These .S files might be working when
compiled by gas, but llvm assembler's output should
be more correct or conservative.
Change-Id: I4e578dbc8155c0d06d1bbc1c33ec4cc851a18479
