Add 32-bit version of llvm-allocated-type.

README.chromium

Index: README.chromium
===================================================================
--- README.chromium	(revision 169608)
+++ README.chromium	(working copy)
@@ -27,8 +27,13 @@
 Then, Clang inserts a call for one of these functions in every new/delete
 expressions as below.
 
-operator new(...) calls are replaced to 
-=> __op_new_intercept__(operator new(...), size, type) 
+operator new(...) calls are replaced to
+=> __op_new_intercept__(operator new(...), size, type)
 
-operator delete(ptr [, size]) calls are replaced to 
-=> operator delete(__op_delete_intercept__(ptr, size, type) [, size]) 
+operator delete(ptr [, size]) calls are replaced to
+=> operator delete(__op_delete_intercept__(ptr, size, type) [, size])
+
+Note:
+32-bit Clang is officially unsupported.  The 32-bit Clang in Linux_ia32/ is
+specially prepared only for comparing 32-bit and 64-bit memory usage.  Any
+failure by this compiler should not close the tree.