SpirvShader: Make accessors private.
SpirvShader: Make accessors private.

getType(), getObject() and getFunction() are only internally used, make them private.

Minor refactoring related to spirv function inlining.

Bug: b/133213304
Change-Id: I75f9f5488a8485161d534b56eb6530c2946bf49e
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/33353
Reviewed-by: Nicolas Capens <51edc787c30f24c4904e8ffbb5523c3a9f7a451d@google.com>
Reviewed-by: Chris Forbes <c3279c50043e18e9442c1ae071cafa0e7a4ca967@google.com>
Tested-by: Ben Clayton <1f693eb7158dc33015048c09d6712f74dabddf79@google.com>
Kokoro-Presubmit: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

bkaradzic/SwiftShader,google/swiftshader,google/swiftshader,bkaradzic/SwiftShader,bkaradzic/SwiftShader,bkaradzic/SwiftShader,bkaradzic/SwiftShader,google/swiftshader