[llvm] [MemProf] Use radix tree for alloc contexts in bitcode summaries (PR #117066)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `llvm-nvptx64-nvidia-ubuntu` running on `as-builder-7` while building `llvm` at step 5 "build-unified-tree".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/160/builds/8906

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 5 (build-unified-tree) failure: build (failure)
...
56.053 [111/9/2572] Linking CXX shared library lib/libLLVMIRPrinter.so.20.0git
56.074 [110/9/2573] Creating library symlink lib/libLLVMIRPrinter.so
56.075 [110/8/2574] Linking CXX shared library lib/libLLVMFrontendAtomic.so.20.0git
56.076 [109/8/2575] Linking CXX shared library lib/libLLVMFrontendDriver.so.20.0git
56.078 [108/8/2576] Linking CXX executable bin/llvm-sim
56.083 [108/7/2577] Linking CXX shared library lib/libLLVMTarget.so.20.0git
56.089 [107/7/2578] Linking CXX executable bin/llvm-tli-checker
56.096 [107/6/2579] Creating library symlink lib/libLLVMFrontendAtomic.so
56.097 [107/5/2580] Creating library symlink lib/libLLVMFrontendDriver.so
56.100 [107/4/2581] Linking CXX shared library lib/libLLVMBitWriter.so.20.0git
FAILED: lib/libLLVMBitWriter.so.20.0git 
: && /usr/bin/c++ -fPIC -fPIC -fno-semantic-interposition -fvisibility-inlines-hidden -Werror=date-time -fno-lifetime-dse -Wall -Wextra -Wno-unused-parameter -Wwrite-strings -Wcast-qual -Wno-missing-field-initializers -pedantic -Wno-long-long -Wimplicit-fallthrough -Wno-uninitialized -Wno-nonnull -Wno-class-memaccess -Wno-redundant-move -Wno-pessimizing-move -Wno-noexcept-type -Wdelete-non-virtual-dtor -Wsuggest-override -Wno-comment -Wno-misleading-indentation -Wctad-maybe-unsupported -fdiagnostics-color -ffunction-sections -fdata-sections -O3 -DNDEBUG  -Wl,-z,defs -Wl,-z,nodelete -fuse-ld=gold   -Wl,--gc-sections -shared -Wl,-soname,libLLVMBitWriter.so.20.0git -o lib/libLLVMBitWriter.so.20.0git lib/Bitcode/Writer/CMakeFiles/LLVMBitWriter.dir/BitWriter.cpp.o lib/Bitcode/Writer/CMakeFiles/LLVMBitWriter.dir/BitcodeWriter.cpp.o lib/Bitcode/Writer/CMakeFiles/LLVMBitWriter.dir/BitcodeWriterPass.cpp.o lib/Bitcode/Writer/CMakeFiles/LLVMBitWriter.dir/ValueEnumerator.cpp.o  -Wl,-rpath,"\$ORIGIN/../lib:/home/buildbot/worker/as-builder-7/ramdisk/llvm-nvptx64-nvidia-ubuntu/build/lib:"  lib/libLLVMAnalysis.so.20.0git  lib/libLLVMObject.so.20.0git  lib/libLLVMCore.so.20.0git  lib/libLLVMMC.so.20.0git  lib/libLLVMTargetParser.so.20.0git  lib/libLLVMSupport.so.20.0git  -Wl,-rpath-link,/home/buildbot/worker/as-builder-7/ramdisk/llvm-nvptx64-nvidia-ubuntu/build/lib && :
lib/Bitcode/Writer/CMakeFiles/LLVMBitWriter.dir/BitcodeWriter.cpp.o:BitcodeWriter.cpp:function writeMemoryProfileRadixTree(llvm::MapVector<unsigned long, llvm::SmallVector<unsigned int, 12u>, llvm::DenseMap<unsigned long, unsigned int, llvm::DenseMapInfo<unsigned long, void>, llvm::detail::DenseMapPair<unsigned long, unsigned int> >, llvm::SmallVector<std::pair<unsigned long, llvm::SmallVector<unsigned int, 12u> >, 0u> >&&, llvm::BitstreamWriter&, unsigned int): error: undefined reference to 'llvm::DenseMap<unsigned int, llvm::memprof::FrameStat, llvm::DenseMapInfo<unsigned int, void>, llvm::detail::DenseMapPair<unsigned int, llvm::memprof::FrameStat> > llvm::memprof::computeFrameHistogram<unsigned int>(llvm::MapVector<unsigned long, llvm::SmallVector<unsigned int, llvm::CalculateSmallVectorDefaultInlinedElements<unsigned int>::value>, llvm::DenseMap<unsigned long, unsigned int, llvm::DenseMapInfo<unsigned long, void>, llvm::detail::DenseMapPair<unsigned long, unsigned int> >, llvm::SmallVector<std::pair<unsigned long, llvm::SmallVector<unsigned int, llvm::CalculateSmallVectorDefaultInlinedElements<unsigned int>::value> >, 0u> >&)'
lib/Bitcode/Writer/CMakeFiles/LLVMBitWriter.dir/BitcodeWriter.cpp.o:BitcodeWriter.cpp:function writeMemoryProfileRadixTree(llvm::MapVector<unsigned long, llvm::SmallVector<unsigned int, 12u>, llvm::DenseMap<unsigned long, unsigned int, llvm::DenseMapInfo<unsigned long, void>, llvm::detail::DenseMapPair<unsigned long, unsigned int> >, llvm::SmallVector<std::pair<unsigned long, llvm::SmallVector<unsigned int, 12u> >, 0u> >&&, llvm::BitstreamWriter&, unsigned int): error: undefined reference to 'llvm::memprof::CallStackRadixTreeBuilder<unsigned int>::build(llvm::MapVector<unsigned long, llvm::SmallVector<unsigned int, 12u>, llvm::DenseMap<unsigned long, unsigned int, llvm::DenseMapInfo<unsigned long, void>, llvm::detail::DenseMapPair<unsigned long, unsigned int> >, llvm::SmallVector<std::pair<unsigned long, llvm::SmallVector<unsigned int, 12u> >, 0u> >&&, std::optional<llvm::DenseMap<unsigned int, unsigned int, llvm::DenseMapInfo<unsigned int, void>, llvm::detail::DenseMapPair<unsigned int, unsigned int> > const>, llvm::DenseMap<unsigned int, llvm::memprof::FrameStat, llvm::DenseMapInfo<unsigned int, void>, llvm::detail::DenseMapPair<unsigned int, llvm::memprof::FrameStat> >&)'
collect2: error: ld returned 1 exit status
56.103 [107/3/2582] Creating library symlink lib/libLLVMTarget.so
56.120 [107/2/2583] Linking CXX shared library lib/libLLVMSandboxIR.so.20.0git
56.263 [107/1/2584] Linking CXX shared library lib/libLLVMTransformUtils.so.20.0git
ninja: build stopped: subcommand failed.

```

</details>

https://github.com/llvm/llvm-project/pull/117066