[turbofan] Factor C call descriptor building into compiler/c-linkage.cc.

[turbofan] Factor C call descriptor building into compiler/c-linkage.cc.

This is the first step in cutting the Gordian linkage/linkage-impl knot.

This basically changes the axis along which we organize call descriptor
building logic from having platform-specific files dedicated to all call
descriptor types to having call-descriptor-type-specific files that have

The next step is to factor the JS, code stub, and runtime call descriptors
similarly, dumping them into:
  compiler/js-linkage.cc
  compiler/runtime-linkage.cc
  compiler/code-stub-linkage.cc

 or, alternatively, all of them just into compiler/js-linkage.cc.

This also anticipates a wasm-linkage.cc file in the future.

R=bmeurer@chromium.org,danno@chromium.org
BUG=

Committed: https://crrev.com/c215c9569ee362bdd4b151499b6c5f5822bb4e45
Cr-Commit-Position: refs/heads/master@{#29931}

[Benedikt Meurer, 2015-07-30 06:35:14]

This approach will not work because you add new static initializers until
uniform initialization and constexpr is allowed.

[titzer, 2015-07-30 07:12:40]

On 2015/07/30 06:35:14, Benedikt Meurer wrote:
> This approach will not work because you add new static initializers until
> uniform initialization and constexpr is allowed.

Yeah, I need to make the kParamRegisters array into a function.

I was considering adding a kReturnRegister0 and kReturnRegister1 to the
assembler to obviate the need for the other array. WDYT?

[titzer, 2015-07-30 09:54:39]

On 2015/07/30 07:12:40, titzer wrote:
> On 2015/07/30 06:35:14, Benedikt Meurer wrote:
> > This approach will not work because you add new static initializers until
> > uniform initialization and constexpr is allowed.
> 
> Yeah, I need to make the kParamRegisters array into a function.
> 
> I was considering adding a kReturnRegister0 and kReturnRegister1 to the
> assembler to obviate the need for the other array. WDYT?

PTAL, I've used macros to avoid the static initializer problem. It also makes
the config a bit smaller, though MORE_SHOUTING is required.

[Benedikt Meurer, 2015-07-30 12:34:22]

Template magic to macro magic transition :-)
LGTM.

[titzer, 2015-07-30 12:34:38]

The CQ bit was checked by titzer@chromium.org

[commit-bot: I haz the power, 2015-07-30 12:34:49]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1266603002/50013
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1266603002/50013

[commit-bot: I haz the power, 2015-07-30 12:36:20]

Committed patchset #5 (id:50013)

[commit-bot: I haz the power, 2015-07-30 12:36:34]

Patchset 5 (id:??) landed as
https://crrev.com/c215c9569ee362bdd4b151499b6c5f5822bb4e45
Cr-Commit-Position: refs/heads/master@{#29931}