Change format of -X arguments to require value after '='

Report a warning when an argument is passed in the old form (with the
whitespace)

 #KT-17264 Fixed

libraries/tools/binary-compatibility-validator/build.gradle

@@ -17,7 +17,7 @@ sourceSets {
 
 compileTestKotlin {
     kotlinOptions {
-        freeCompilerArgs = ['-Xdump-declarations-to', "${buildDir}/cases-declarations.json"]
+        freeCompilerArgs = ["-Xdump-declarations-to=${buildDir}/cases-declarations.json"]
     }
 }
 

libraries/tools/kotlin-gradle-plugin/src/test/kotlin/org/jetbrains/kotlin/gradle/dsl/KotlinJvmOptionsImplTest.kt

@@ -12,7 +12,7 @@ class KotlinJvmOptionsTest {
                 "-Xreport-perf",
                 "-Xallow-kotlin-package",
                 "-Xmultifile-parts-inherit",
-                "-Xdump-declarations-to", "declarationsPath",
+                "-Xdump-declarations-to=declarationsPath",
                 "-script-templates", "a,b,c")
 
         val arguments = K2JVMCompilerArguments()

libraries/tools/kotlin-reflect/build.gradle

@@ -74,7 +74,7 @@ compileKotlin {
         freeCompilerArgs = ["-version",
                             "-Xallow-kotlin-package",
                             "-module-name", "kotlin-reflection",
-                            "-Xdump-declarations-to", "${buildDir}/reflect-declarations.json"]
+                            "-Xdump-declarations-to=${buildDir}/reflect-declarations.json"]
     }
 }
 

libraries/tools/runtime/build.gradle

@@ -43,7 +43,7 @@ compileKotlin {
     kotlinOptions {
         freeCompilerArgs = [
                 "-Xallow-kotlin-package",
-                "-Xdump-declarations-to", "${buildDir}/runtime-declarations.json",
+                "-Xdump-declarations-to=${buildDir}/runtime-declarations.json",
                 "-cp", "${rootDir}/../dist/builtins",
                 "-module-name", project.name
         ]