Instructions for use

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@255 91177308-0d34-0410-b5e6-96231b3b80d8

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+
+To run this utility:
+
+For a list of options:
+        llc -h
+
+To see the generated machine instructions:
+        llc -debug_select 1 <bytecode-file>
+
+I left that as a "debugging" option since it is not real code.
+Use 2 instead of 1 to dump the mapping between LLVM instructions and
+Machine instructions, and 5 to see the patterns chosen by BURG.
+These outputs aren't very clean.
+