Initial project file for SPIR-V Tools fuzzing (#6330)

* Add SPIR-V Tools fuzzer targets

Adds fuzzer targets for the SPIR-V Tools project.

* Disable honggfuzz, as it was failing in the CI.

projects/spirv-tools/Dockerfile

@@ -0,0 +1,21 @@
+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+################################################################################
+
+FROM gcr.io/oss-fuzz-base/base-builder
+RUN apt-get update && apt-get install -y make autoconf automake libtool ninja-build
+RUN git clone --depth 1 https://github.com/KhronosGroup/SPIRV-Tools.git spirv-tools
+WORKDIR spirv-tools
+COPY build.sh $SRC/

projects/spirv-tools/build.sh

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+#!/bin/bash -eu
+# Copyright 2021 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+################################################################################
+
+git clone https://github.com/KhronosGroup/SPIRV-Headers external/spirv-headers --depth=1
+git clone https://github.com/protocolbuffers/protobuf   external/protobuf      --branch v3.13.0.1
+
+mkdir build
+cd build
+
+CMAKE_ARGS="-DSPIRV_BUILD_LIBFUZZER_TARGETS=ON"
+
+# With ubsan, RTTI must be enabled due to certain checks (vptr) requiring it.
+if [ $SANITIZER == "undefined" ];
+then
+  CMAKE_ARGS="${CMAKE_ARGS} -DENABLE_RTTI=ON"
+fi
+cmake -G Ninja .. ${CMAKE_ARGS}
+ninja
+
+cp test/fuzzers/spvtools_*_fuzzer $OUT

projects/spirv-tools/project.yaml

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+homepage: https://github.com/KhronosGroup/SPIRV-Tools
+language: c++
+primary_contact: rharrison@google.com 
+auto_ccs:
+  - "afdx@google.com"
+sanitizers:
+  - address
+  - memory
+  - undefined
+main_repo: 'https://github.com/KhronosGroup/SPIRV-Tools.git'
+architectures:
+  - x86_64
+  - i386
+fuzzing_engines:
+  - libfuzzer
+  - afl