Merge pull request dotnet/coreclr#3362 from AndyAyersMS/InlineRefactor5a2

InlineRefactoring: capturing bits of legacy policy

Commit migrated from https://github.com/dotnet/coreclr/commit/3e8d97edfef3e8492cf9f0b2e52dfa9570d2a33e

diff --cc src/coreclr/src/jit/compiler.cpp
Simple merge

diff --cc src/coreclr/src/jit/compiler.h
Simple merge

diff --cc src/coreclr/src/jit/flowgraph.cpp
Simple merge

diff --cc src/coreclr/src/jit/importer.cpp
Simple merge