We have a textual representation of contextual profiles for test scenarios, mainly. This patch moves that to YAML instead of JSON. YAML is more succinct and readable (some of the .ll tests should be illustrative). In addition, JSON is parse-able by the YAML reader.
A subsequent patch will address deserialization.
(thanks, @kazutakahirata, for showing me how to use the llvm YAML reader/writer APIs, which I incorrectly thought to be more low-level than the JSON ones!)
Reading text files on z/OS relies on auto conversion to handle
ASCII/EBCDIC correctly. For this to work files need to be opened in text
mode is that is the type of the file. This PR fixes `llvm-ctxprof`
utility in this regards which in turn fixes the following LIT failure on
z/OS:
`FAIL: LLVM :: Analysis/CtxProfAnalysis/flatten-zero-path.ll`
Making the synthesis of a contextual profile file from a JSON descriptor more reusable, for unittest authoring purposes.
The functionality round-trips through the binary format - no reason, currently, to support other ways of loading contextual profiles.
This is a tool to simplify testing. It generates a valid contextual profile file from a json representation.
The tool is authored to allow for future evolution, e.g. if we want to support profile merging or other tasks, not necessarily scoped to testing.
