unwindstack: rename Memory::Read to ReadFully.

Rename Memory::Read to ReadFully to match its semantics with that of
android::base. ReadPartially will be renamed to Read in a follow up
commit, kept intentionally separate so that there aren't any callers
accidentally switched from ReadFully to Read.

Test: treehugger
Change-Id: I7d845ac5244c3025d92c8512e960e5d0d1da05af
diff --git a/libunwindstack/DwarfOp.cpp b/libunwindstack/DwarfOp.cpp
index b3fd0df..3b3d340 100644
--- a/libunwindstack/DwarfOp.cpp
+++ b/libunwindstack/DwarfOp.cpp
@@ -141,7 +141,7 @@
   // Read the address and dereference it.
   AddressType addr = StackPop();
   AddressType value;
-  if (!regular_memory()->Read(addr, &value, sizeof(value))) {
+  if (!regular_memory()->ReadFully(addr, &value, sizeof(value))) {
     last_error_ = DWARF_ERROR_MEMORY_INVALID;
     return false;
   }
@@ -159,7 +159,7 @@
   // Read the address and dereference it.
   AddressType addr = StackPop();
   AddressType value = 0;
-  if (!regular_memory()->Read(addr, &value, bytes_to_read)) {
+  if (!regular_memory()->ReadFully(addr, &value, bytes_to_read)) {
     last_error_ = DWARF_ERROR_MEMORY_INVALID;
     return false;
   }