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Slow kernel compilation #65

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IIRC it used to be 200us or so, and @vtjnash mentioned Base compilation taking 1us 1ms or so for the simplest functions. This is pretty slow then:

julia> kernel() = return
kernel (generic function with 1 method)

julia> include("pkg/GPUCompiler/test/definitions/native.jl")
native_code_execution (generic function with 1 method)

julia> job, kwargs = native_job(kernel, Tuple{})
(CompilerJob of function kernel() for NativeCompilerTarget, Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}())

julia> @benchmark GPUCompiler.compile(:asm, job)
BenchmarkTools.Trial: 
  memory estimate:  389.70 KiB
  allocs estimate:  7019
  --------------
  minimum time:     7.027 ms (0.00% GC)
  median time:      7.784 ms (0.00% GC)
  mean time:        7.805 ms (0.28% GC)
  maximum time:     11.175 ms (24.24% GC)
  --------------
  samples:          640
  evals/sample:     1
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