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from bb748a1 Allow StringRef to be constructed from a null pointer. new fdf7354 [thinlto] Basic thinlto fdo heuristic

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Summary of changes: include/llvm/Analysis/ModuleSummaryAnalysis.h | 5 +- include/llvm/Bitcode/LLVMBitCodes.h | 8 +- include/llvm/IR/ModuleSummaryIndex.h | 20 ++-- lib/Analysis/ModuleSummaryAnalysis.cpp | 54 ++++++++--- lib/Bitcode/Reader/BitcodeReader.cpp | 57 +++++++---- lib/Bitcode/Writer/BitcodeWriter.cpp | 20 ++-- lib/LTO/ThinLTOCodeGenerator.cpp | 4 +- lib/Transforms/IPO/FunctionImport.cpp | 15 ++- ...hinlto-function-summary-callgraph-combined.1.bc | Bin 0 -> 360 bytes ...to-function-summary-callgraph-pgo-combined.1.bc | Bin 0 -> 368 bytes .../thinlto-function-summary-callgraph-pgo.1.bc | Bin 0 -> 1060 bytes ...o-function-summary-callgraph-profile-summary.ll | 27 ++++++ .../Inputs/thinlto-function-summary-callgraph.1.bc | Bin 0 -> 968 bytes test/Bitcode/summary_version.ll | 2 +- test/Bitcode/thinlto-alias.ll | 4 +- .../thinlto-function-summary-callgraph-pgo.ll | 17 +++- ...o-function-summary-callgraph-profile-summary.ll | 98 +++++++++++++++++++ test/Bitcode/thinlto-function-summary-callgraph.ll | 12 ++- test/Bitcode/thinlto-function-summary-refgraph.ll | 10 +- .../FunctionImport/Inputs/hotness_based_import.ll | 43 +++++++++ .../FunctionImport/hotness_based_import.ll | 106 +++++++++++++++++++++ 21 files changed, 422 insertions(+), 80 deletions(-) create mode 100644 test/Bitcode/Inputs/thinlto-function-summary-callgraph-combined.1.bc create mode 100644 test/Bitcode/Inputs/thinlto-function-summary-callgraph-pgo-comb [...] create mode 100644 test/Bitcode/Inputs/thinlto-function-summary-callgraph-pgo.1.bc create mode 100644 test/Bitcode/Inputs/thinlto-function-summary-callgraph-profile- [...] create mode 100644 test/Bitcode/Inputs/thinlto-function-summary-callgraph.1.bc create mode 100644 test/Bitcode/thinlto-function-summary-callgraph-profile-summary.ll create mode 100644 test/Transforms/FunctionImport/Inputs/hotness_based_import.ll create mode 100644 test/Transforms/FunctionImport/hotness_based_import.ll