Migrate compiler, idea and others to new case conversion api

core/descriptors/src/org/jetbrains/kotlin/builtins/functions/FunctionInvokeDescriptor.kt

@@ -138,7 +138,7 @@ class FunctionInvokeDescriptor private constructor(
                 "E" -> "receiver"
                 else -> {
                     // Type parameter "P1" -> value parameter "p1", "P2" -> "p2", etc.
-                    typeParameterName.toLowerCase()
+                    typeParameterName.lowercase()
                 }
             }
 

core/descriptors/src/org/jetbrains/kotlin/renderer/DescriptorRendererOptionsImpl.kt

@@ -48,7 +48,7 @@ internal class DescriptorRendererOptionsImpl : DescriptorRendererOptions {
             assert(!field.name.startsWith("is")) { "Fields named is* are not supported here yet" }
             val value = property.getValue(
                     this,
-                    PropertyReference1Impl(DescriptorRendererOptionsImpl::class, field.name, "get" + field.name.capitalize())
+                    PropertyReference1Impl(DescriptorRendererOptionsImpl::class, field.name, "get" + field.name.replaceFirstChar(Char::uppercaseChar))
             )
             field.set(copy, copy.property(value))
         }