Move KFunctionN classes to package "kotlin.reflect"
Add default import "kotlin.reflect"
Create error type if reflection class isn't found

Introduce a new diagnostic fired when reflection types aren't found in the
classpath
Introduce FunctionImpl and ExtensionFunctionImpl classes

Old FunctionImpl0,1,2,... will be dropped since they had no purpose
Drop FunctionImplN and ExtensionFunctionImplN

We have FunctionImpl and ExtensionFunctionImpl classes now (2 classes, not 46)
Fix generic signature for SAM adapters and constructors

SAM-related code in codegen was using JavaClassDescriptor directly, which has
an erased signature. Create and use a new abstraction SamType which has a full
generic signature of a type which was used in the SAM construct
Move and rename KFunctionImpl classes

Move from package "kotlin.reflect" to "kotlin.reflect.jvm.internal". They are
internal detail of the compiler and should not be used directly (especially now
that "kotlin.reflect" is in default import paths).

Also rename "KFunctionImplN" to "KFunctionNImpl", because this name makes more
sense
Change logic of loading "suppress" annotation class descriptor

Instead of loading the descriptor and checking equals(), we now check if the
annotation is in fact "suppress" by simply comparing its FQ name. This allows
us to suppress warnings while compiling built-ins: the problem is that
built-ins have its own "suppress" annotation class (defined in the sources)
which differs from the one loaded by the compiler (from kotlin-compiler.jar)
Minor optimization in KotlinBuiltIns.isSpecialClassWithNoSupertypes
Increase ABI version after changes to FunctionImpl* classes
Remove suspicious JetTypeImpl constructors

Most of the time they were used for classes without type parameters, and
getDefaultType() is supposed to be used there (additionally it may be cached)
Introduce AbstractTypeParameterDescriptor

- pull the logic up from TypeParameterDescriptorImpl and
  AbstractLazyTypeParameterDescriptor (it was mostly duplicated)
- delete some unused methods
test