Haskell Program Coverage

This large checkin is the new ghc version of Haskell
Program Coverage, an expression-level coverage tool for Haskell.

Parts:

 - Hpc.[ch] - small runtime support for Hpc; reading/writing *.tix files.
 - Coverage.lhs - Annotates the HsSyn with coverage tickboxes.
  - New Note's in Core,
      - TickBox      -- ticked on entry to sub-expression
      - BinaryTickBox  -- ticked on exit to sub-expression, depending
	       	     -- on the boolean result.

  - New Stg level TickBox (no BinaryTickBoxes, though) 

You can run the coverage tool with -fhpc at compile time. 
Main must be compiled with -fhpc. 
				      

1 files changed, 6 insertions, 0 deletions

diff --git a/driver/mangler/ghc-asm.lprl b/driver/mangler/ghc-asm.lprl
index 902593ea7f..21b56f8039 100644
--- a/driver/mangler/ghc-asm.lprl
+++ b/driver/mangler/ghc-asm.lprl
@@ -699,6 +699,12 @@ sub mangle_asm {
 	    $chkcat[$i]  = 'data';
 	    $chksymb[$i] = '';
 
+        } elsif ( /^${T_US}([A-Za-z0-9_]+)_hpc?${T_POST_LBL}$/o ) {
+           # hpc shares tick boxes across modules
+           $chk[++$i]   = $_;
+           $chkcat[$i]  = 'data';
+           $chksymb[$i] = '';
+
 	} elsif ( /^${T_US}([A-Za-z0-9_]+)_(alt|dflt)${T_POST_LBL}$/o ) {
 	    $chk[++$i]   = $_;
 	    $chkcat[$i]  = 'misc';