Handle already existing targets of different name

In other words, if, in bp2build, module "foo" would generate "foo",
and "foo_two", and "foo_two" already exists in a build file,
bp2build should label "foo" as being unconvertible.

Fixes: 301321658
Fixes: 301312582
Bug: 285631638
Test: Unit tests
Test: Verified that `m bp2build` results in bit-for-bit identical
contents for out/soong/bp2build before and after this change.

Change-Id: Icbbdd69fce83579ec9b172d04b2bf1f294698f70
diff --git a/android/module.go b/android/module.go
index f48af4a..ceb54de 100644
--- a/android/module.go
+++ b/android/module.go
@@ -565,8 +565,8 @@
 	AddProperties(props ...interface{})
 	GetProperties() []interface{}
 
-	// IsConvertedByBp2build returns whether this module was converted via bp2build
-	IsConvertedByBp2build() bool
+	// If this module should not have bazel BUILD definitions generated by bp2build,
+	// GetUnconvertedReason returns a reason this is the case.
 	GetUnconvertedReason() *UnconvertedReason
 
 	// Bp2buildTargets returns the target(s) generated for Bazel via bp2build for this module
@@ -1639,35 +1639,16 @@
 }
 
 func (m *ModuleBase) addBp2buildInfo(info bp2buildInfo) {
-	reason := m.commonProperties.BazelConversionStatus.UnconvertedReason
-	if reason != nil {
-		panic(fmt.Errorf("bp2build: internal error trying to convert module '%s' marked unconvertible. Reason type %d: %s",
-			m.Name(),
-			reason.ReasonType,
-			reason.Detail))
-	}
 	m.commonProperties.BazelConversionStatus.Bp2buildInfo = append(m.commonProperties.BazelConversionStatus.Bp2buildInfo, info)
 }
 
 func (m *ModuleBase) setBp2buildUnconvertible(reasonType bp2build_metrics_proto.UnconvertedReasonType, detail string) {
-	if len(m.commonProperties.BazelConversionStatus.Bp2buildInfo) > 0 {
-		fmt.Println(m.commonProperties.BazelConversionStatus.Bp2buildInfo)
-		panic(fmt.Errorf("bp2build: internal error trying to mark converted module '%s' as unconvertible. Reason type %d: %s",
-			m.Name(),
-			reasonType,
-			detail))
-	}
 	m.commonProperties.BazelConversionStatus.UnconvertedReason = &UnconvertedReason{
 		ReasonType: int(reasonType),
 		Detail:     detail,
 	}
 }
 
-// IsConvertedByBp2build returns whether this module was converted via bp2build.
-func (m *ModuleBase) IsConvertedByBp2build() bool {
-	return len(m.commonProperties.BazelConversionStatus.Bp2buildInfo) > 0
-}
-
 func (m *ModuleBase) GetUnconvertedReason() *UnconvertedReason {
 	return m.commonProperties.BazelConversionStatus.UnconvertedReason
 }