Convert private variables to function scope.

When a private variable is used in a single function, it can be
converted to a function scope variable in that function.  This adds a
pass that does that.  The pass can be enabled using the option
`--private-to-local`.

This transformation allows other transformations to act on these
variables.

Also moved `FindPointerToType` from the inline class to the type manager.

1 files changed, 6 insertions, 0 deletions

diff --git a/include/spirv-tools/optimizer.hpp b/include/spirv-tools/optimizer.hpp
index 754d2b99..f5cdee24 100644
--- a/include/spirv-tools/optimizer.hpp
+++ b/include/spirv-tools/optimizer.hpp
@@ -442,6 +442,12 @@ Optimizer::PassToken CreateRedundancyEliminationPass();
 // This pass replaces composite function scope variables with variables for each
 // element if those elements are accessed individually.
 Optimizer::PassToken CreateScalarReplacementPass();
+
+// Create a private to local pass.
+// This pass looks for variables delcared in the private storage class that are
+// used in only one function.  Those variables are moved to the function storage
+// class in the function that they are used.
+Optimizer::PassToken CreatePrivateToLocalPass();
 }  // namespace spvtools
 
 #endif  // SPIRV_TOOLS_OPTIMIZER_HPP_