Handle empty inlining stacks in create_llvm_prof (google#77)

This might validly happen in cases where the binary offset corresponds to a .S file (for example).

Merge pull request google#59 from taewookoh/use_discriminator_encoding

Use discriminator encoding

Merge pull request google#52 from gburgessiv/master

Fix path truncation in profile_creator

Merge pull request google#45 from google/sync

Fix the unsuppported event type issue: when we process new perf.data …

Merge pull request google#32 from google/use-llvm-profiledata

Re-factor profile writer to separate LLVM and GCC writers.

Generate a binary-encoded profile for LLVM profiles.

This changes the LLVM profile writer to use a more compact binary
encoding, as supported in upstream LLVM as of

http://llvm.org/viewvc/llvm-project?rev=250539&view=rev

This change breaks compatibility with previous versions. To dump the
generated file, you will need to use the llvm-profdata tool in LLVM.
Make sure to get a version of llvm-profdata at at least revision 250539.

Merge pull request google#14 from google/sync

Fix typo to pattern match C4Ev too.

Merge pull request google#13 from google/sync

Sync with google internal branch.

Merge pull request google#10 from google/sync

Sync with google depot. Fix a bug in HasSuffixString.

Initial version