Roll third_party/re2/ 848dfb7e1..e356bd3f8 (6 commits)

google/re2@848dfb7...e356bd3

$ git log 848dfb7e1..e356bd3f8 --date=short --no-merges --format='%ad %ae %s'
2019-07-07 junyer Make RE2::Set canonicalize DFA states.
2019-07-05 junyer Fix SimplifyStringSet() for really reals. And the test.
2019-07-04 junyer Don't let Prefilter::OrStrings() return NULL.
2019-07-04 junyer Fix SimplifyStringSet() properly. Ensure test coverage.
2019-07-04 junyer Fix a typographical error.
2019-07-04 junyer Stop SimplifyStringSet() from finding "" in everything.

Roll third_party/spirv-cross/ 9a6e2534e..53ab2144b (7 commits)

KhronosGroup/SPIRV-Cross@9a6e253...53ab214

$ git log 9a6e2534e..53ab2144b --date=short --no-merges --format='%ad %ae %s'
2019-07-08 post Fall back to complex loop if non-trivial continue block is found.
2019-07-08 post Add test shaders for NonUniformEXT propagation.
2019-07-08 post Propagate NonUniformEXT to dependent expressions.
2019-07-05 post Add simple test for extended debug operations.
2019-07-04 lifeng.pan Parse SPIR-V debug information extended instructions, as well as OpNoLine.
2019-07-03 post Don't use scalar dot().
2019-07-03 post MSL/HLSL: Support scalar reflect and refract.

Roll third_party/spirv-headers/ 123dc27..29c1114 (1 commit)

KhronosGroup/SPIRV-Headers@123dc27...29c1114

$ git log 123dc27..29c1114 --date=short --no-merges --format='%ad %ae %s'
2019-06-15 antiagainst Reserve ID 23 for MLIR SPIR-V Serializer

Roll third_party/spirv-tools/ 9702d47..b8ab808 (5 commits)

KhronosGroup/SPIRV-Tools@9702d47...b8ab808

$ git log 9702d47..b8ab808 --date=short --no-merges --format='%ad %ae %s'
2019-07-07 afdx Shrinker for spirv-fuzz (KhronosGroup#2708)
2019-07-04 stevenperron Perform merge return with single return in loop. (KhronosGroup#2714)
2019-07-04 stevenperron Do not inline OpKill Instructions (KhronosGroup#2713)
2019-07-04 afdx Refactor reducer options (KhronosGroup#2709)
2019-07-03 52076061+digit-google Fix BUILD.gn for Fuchsia platform build. (KhronosGroup#2692)

Created with:
  roll-dep third_party/effcee third_party/glslang third_party/googletest third_party/re2 third_party/spirv-cross third_party/spirv-headers third_party/spirv-tools