* Rolling 5 dependencies

Roll third_party/glslang/ 4b2483e..1f0fcbe (9 commits)

KhronosGroup/glslang@4b2483e...1f0fcbe

$ git log 4b2483e..1f0fcbe --date=short --no-merges --format='%ad %ae %s'
2020-03-21 arnfranke Make file formatting comply with POSIX and Unix standards
2020-03-19 courtneygo Fix MSVC build issue - remove invalid character
2020-03-18 alele Re-add NV enums for raytracing to prevent build breaks.
2020-03-18 cepheus Fix KhronosGroup#2132: constant matrix constructor from single non-scalar argument
2020-03-18 cepheus Bump version (also fix line endings the grammar).
2020-03-17 dkoch update known_good
2020-03-17 dkoch Add support for GLSL_EXT_ray_tracing
2020-03-17 cepheus SPV headers: Bump up to the latest header.
2020-03-16 jbolz Forbid memoryBarrierAtomicCounter for Vulkan compiles

Roll third_party/googletest/ e588eb1ff..749148f1a (10 commits)

google/googletest@e588eb1...749148f

$ git log e588eb1ff..749148f1a --date=short --no-merges --format='%ad %ae %s'
2020-03-20 absl-team Googletest export
2020-03-17 absl-team Googletest export
2020-03-16 dmauro Googletest export
2020-03-13 absl-team Googletest export
2020-03-06 absl-team Googletest export
2020-03-03 absl-team Googletest export
2020-03-03 absl-team Googletest export
2020-03-11 romain.geissler Make sure IsATTY does not clobber errno.
2020-02-21 johan.mabille Fixed warnings
2020-01-29 krystian.kuzniarek remove a dead reference to the Autotools script

Roll third_party/spirv-cross/ 65aa0c35d..871c85d7f (4 commits)

KhronosGroup/SPIRV-Cross@65aa0c3...871c85d

$ git log 65aa0c35d..871c85d7f --date=short --no-merges --format='%ad %ae %s'
2020-03-19 post GLSL: Implement GL_EXT_shader_framebuffer_fetch.
2020-03-19 post Run format_all.sh.
2020-03-19 post GLSL/HLSL: Fix nonuniform qualifier for SSBO atomics.
2020-03-19 post GLSL/HLSL: Implement nonuniform qualifier for image atomics.

Roll third_party/spirv-headers/ a17e17e..f8bf11a (5 commits)

KhronosGroup/SPIRV-Headers@a17e17e...f8bf11a

$ git log a17e17e..f8bf11a --date=short --no-merges --format='%ad %ae %s'
2020-03-17 dkoch Add shadercalls scope
2020-03-03 ntorosda Added ray flags, primitive culling flags, queries
2020-03-17 cepheus Non-functional: Update header build to match Khronos spec. builder.
2020-02-14 alele Update headers for SPV_KHR_ray_tracing.
2020-01-01 xanto Also propagate SPIRV-Headers version to CMakeLists.txt

Roll third_party/spirv-tools/ 25ede1c..1c8bda3 (7 commits)

KhronosGroup/SPIRV-Tools@25ede1c...1c8bda3

$ git log 25ede1c..1c8bda3 --date=short --no-merges --format='%ad %ae %s'
2020-03-23 jaebaek Add data structure for DebugScope, DebugDeclare in spirv-opt (KhronosGroup#3183)
2020-03-23 ehsannas Whitelist SPV_KHR_ray_tracing (KhronosGroup#3241)
2020-03-23 arnfranke Make file formatting comply with POSIX standards (KhronosGroup#3242)
2020-03-19 dneto Add opt::Operand::AsCString and AsString (KhronosGroup#3240)
2020-03-20 lujiao Add RayQueryProvisionalKHR to opt types (KhronosGroup#3239)
2020-03-17 ehsannas Whitelist SPV_EXT_demote_to_helper_invocation for opt passes (KhronosGroup#3236)
2020-03-17 dgkoch Add support for KHR_ray_{query,tracing} extensions (KhronosGroup#3235)

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

* Updated expectations