Adding experimental iree_io_file_map_view API.

This allows for any iree_io_file_handle_t to be mapped into host memory
on platforms where doing so is supported. Eventually this will be
replaced with a proper mapping object and view API that will allow us
to unify the ELF loading, file_io utils, and parameter handling APIs.

compiler/src/iree/compiler/Modules/IO/Parameters/Transforms/ImportParameters.cpp

@@ -80,10 +80,12 @@ loadParameterIndex(ModuleOp moduleOp, StringRef path,
     return failure();
 
   // Parse the archive as a particular format.
+  iree_allocator_t hostAllocator = iree_allocator_system();
   return handleRuntimeError(
       moduleOp,
       iree_io_parse_file_index(iree_make_string_view(path.data(), path.size()),
-                               fileHandle->get(), parameterIndex),
+                               fileHandle->get(), parameterIndex,
+                               hostAllocator),
       "parsing parameter archive");
 }
 

runtime/bindings/python/io.cc

@@ -98,10 +98,11 @@ void ParameterIndexAddFromFileHandle(ParameterIndex &self, std::string &key,
 void ParameterIndexParseFileHandle(ParameterIndex &self,
                                    FileHandle &file_handle,
                                    std::string &format) {
-  CheckApiStatus(iree_io_parse_file_index(
-                     iree_make_string_view(format.data(), format.size()),
-                     file_handle.raw_ptr(), self.raw_ptr()),
-                 "Could not parse parameter file index");
+  CheckApiStatus(
+      iree_io_parse_file_index(
+          iree_make_string_view(format.data(), format.size()),
+          file_handle.raw_ptr(), self.raw_ptr(), iree_allocator_system()),
+      "Could not parse parameter file index");
 }
 
 void ParameterIndexLoadFile(ParameterIndex &self, std::string &file_path,

runtime/src/iree/base/internal/file_io.c

@@ -466,7 +466,9 @@ iree_status_t iree_file_create_mapped(const char* path, uint64_t file_size,
   IREE_TRACE_ZONE_BEGIN(z0);
 
   iree_file_contents_t* contents = NULL;
-  iree_allocator_malloc(allocator, sizeof(*contents), (void**)&contents);
+  IREE_RETURN_AND_END_ZONE_IF_ERROR(
+      z0,
+      iree_allocator_malloc(allocator, sizeof(*contents), (void**)&contents));
   contents->allocator = allocator;
 
   iree_status_t status = iree_file_create_mapped_platform(