Update the project name in README.md

Per llvm.org: "The name "LLVM" itself is not an acronym; it is the full
name of the project."

llvm-svn: 344766

README.md

@@ -1,4 +1,4 @@
-# Low Level Virtual Machine (LLVM)
+# The LLVM Compiler Infrastructure
 
 This directory and its subdirectories contain source code for LLVM,
 a toolkit for the construction of highly optimized compilers,