C Numbers

[tothambrus11]

This is a draft PR yet, I still need to write tests for it and the API probably needs to be revised.

Capabilities:

• They are Equatable, Movable, Copiable, ExpressibleByIntegerLiteral and ForeignConvertible.
• The C Hylo types can be directly used in FFI bindings thanks to being ForeignConvertible to their corresponding builtin types.

@ffi("hash")
fun hash(_ a: CLong, _ b: CChar,_ c: CInt,_ d: CShort,_ e: CLongLong,_ f: CULong, _ g: CSChar) -> CLongLong

public fun main() {
    print(Int(fromC: hash(1, 2, 3, 4, 5, 6, 7)))
    print(Int(fromC: hash(6, 5, 4, 3, 2, 1, 0)))
    print(Int(fromC: hash(0, 0, 0, 0, 0, 0, 0)))
    print(Int(fromC: hash(-1, -1, -1, -1, -1, 1, -1)))
    print(Int(fromC: hash(-2147483647, -127, -32767, -32767, -9223372036854775807, 4294967295, -128)))
}

// a complicated C hashing function with a lot of parameters of different numeric types
long long hash(long a, char b, int c, short d, long long e, unsigned long f, signed char g) {
    return a * 31 + b * 7 + c * 3 + d * 2 + e * 5 + f * 11 - g * 13;
}

I would welcome feedback on:

• Naming of builtin functions and types
• Naming of Hylo C types.
• Whether to enable assertions in conversions
• API design of C integer <-> Hylo conversions
  • Currently, constructors are available like Int64(fromC:) and CLongLong(_:) convert to and from C types.

[codecov]

Codecov Report

Attention: Patch coverage is 66.58354% with 134 lines in your changes missing coverage. Please review.

Project coverage is 88.19%. Comparing base (0951941) to head (6b81433).

Files with missing lines	Patch %	Lines
Sources/CodeGen/LLVM/Transpilation.swift	42.01%	69 Missing ⚠️
Sources/FrontEnd/Types/BuiltinType.swift	50.00%	34 Missing ⚠️
Sources/IR/Mangling/Demangler.swift	18.18%	9 Missing ⚠️
Sources/IR/BuiltinCNumericTypes+Extensions.swift	86.79%	7 Missing ⚠️
.../GenerateHyloFileTests/GenerateHyloFileTests.swift	0.00%	6 Missing ⚠️
Sources/IR/Operands/Instruction/UnionSwitch.swift	0.00%	4 Missing ⚠️
Sources/FrontEnd/BuiltinFunction.swift	92.30%	3 Missing ⚠️
Sources/FrontEnd/TypeChecking/TypeChecker.swift	83.33%	1 Missing ⚠️
Sources/IR/Module.swift	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1684      +/-   ##
==========================================
- Coverage   88.38%   88.19%   -0.20%     
==========================================
  Files         382      383       +1     
  Lines       31592    31896     +304     
==========================================
+ Hits        27924    28130     +206     
- Misses       3668     3766      +98     

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