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We now have various flags that need to be passed to gcc, but only if
the local gcc version supports them.  So instead of wiring this
knowledge into ghc when it is built, we now put these "extra gcc
flags" into a text file in $libdir, extra-gcc-flags, which is created
by configure.  It is also created by the configure script of a binary
distribution, so a binary dist is independent of the gcc version used
to build it.

Hopefully I got the binary-dist stuff right, but binary dists aren't
currently working so we'll need to come back and check this.

This appears to cause trouble in at least some shells

Refactored linear allocator into separate liveness annotation and allocation stages.
Added graph coloring allocator, use -fregs-graph to enable.
  New dump flags are
    -ddump-asm-native          -- output of cmm -> native transform.
    -ddump-asm-liveness        -- code annotated with register liveness info
    -ddump-asm-coalesce        -- output of register move coalescing
                                    (this is a separate pass when using the coloring allocator)
                                    (this could change in the future)
    -ddump-asm-regalloc        -- code after register allocation
    -ddump-asm-regalloc-stages -- blocks after each build/spill stage of coloring allocator
    -ddump-asm-conflicts       -- a global register liveness graph in graphviz format 
        
The new register allocator will allocate some registers, but it's not
quite ready for prime-time yet. The spill code generator needs some work...

I'm not sure why this was here, but it makes ghci.o get built twice on
Windows, which can cause the build to fail if it tries to link it
in the middle.

This patch adds a check that each imported module is listed in
the dependencies from the previous interface.  It catches the
following cases and forces recompilation:
   - an exposed package has been upgraded
   - we are compiling with different package flags
   - a home module that was shadowing a package module has been removed
   - a new home module has been added that shadows a package module

I haven't yet added the package timestamping as described in #1372.

  * The correct definition of C-- requires that a procedure not
    'fall off the end'.  The 'never returns' annotation tells us
    if a (foreign) call is not going to return.

    Validated!

- Fixed test "Infix" in the testsuite, which Roman added

- Fixes the test "Kind" in the testsuite, which Roman added

We now get the value of can_split from the SplitObjs setting in the
build system, rather than working out whether it should be possible
based on the platform.

Remove the bug that claims GHC treats source files as ISO-8859-1 rather
than UTF8.

Unqualified it's ambiguous with some configurations.

isNilOL is now constant time, rather than possibly having to walk a
tree of Two's. Compiling J.hs from trac #1136 now makes 10302 isNilOL
calls rather than 50050152. It's gone from 10.8% time to being unlisted
(i.e. <= 0.1%).

If the first arg is -v, make ghc-inplace print out the real GHC path
and extra flags it adds