Support LLVM 8+ build changes
Support LLVM 8+ build changes

Bug: b/139412871
Change-Id: I7c6b59a19b6f2fdc6feb7420605c9e7935790a90
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/40588
Presubmit-Ready: Nicolas Capens <51edc787c30f24c4904e8ffbb5523c3a9f7a451d@google.com>
Tested-by: Nicolas Capens <51edc787c30f24c4904e8ffbb5523c3a9f7a451d@google.com>
Reviewed-by: Antonio Maiorano <86d87a6550afb6b07035c9743fa181900589f7e0@google.com>

bkaradzic/SwiftShader,bkaradzic/SwiftShader,google/swiftshader,google/swiftshader,google/swiftshader,bkaradzic/SwiftShader,bkaradzic/SwiftShader,bkaradzic/SwiftShader