Suggest ld and call when failing to link ldh and rst

src/link/patch.cpp

@@ -377,7 +377,11 @@ static int32_t computeRPNExpr(Patch const &patch, std::vector<Symbol> const &fil
 		case RPN_HRAM:
 			value = popRPN(patch);
 			if (value < 0xFF00 || value > 0xFFFF) {
-				firstErrorAt(patch, "Address $%" PRIx32 " for LDH is not in HRAM range", value);
+				firstErrorAt(
+				    patch,
+				    "Address $%" PRIx32 " for LDH is not in HRAM range; use LD instead",
+				    value
+				);
 				value = 0;
 			}
 			value &= 0xFF;
@@ -387,7 +391,9 @@ static int32_t computeRPNExpr(Patch const &patch, std::vector<Symbol> const &fil
 			value = popRPN(patch);
 			// Acceptable values are 0x00, 0x08, 0x10, ..., 0x38
 			if (value & ~0x38) {
-				firstErrorAt(patch, "Value $%" PRIx32 " is not a RST vector", value);
+				firstErrorAt(
+				    patch, "Value $%" PRIx32 " is not a RST vector; use CALL instead", value
+				);
 				value = 0;
 			}
 			value |= 0xC7;

test/link/invalid-patches.out

@@ -1,6 +1,6 @@
 error: JR target must be between -128 and 127 bytes away, not 190; use JP instead
     at invalid-patches.asm(10)
-error: Address $0 for LDH is not in HRAM range
+error: Address $0 for LDH is not in HRAM range; use LD instead
     at invalid-patches.asm(9)
 error: Requested SIZEOF() of undefined section "NonexistentSection"
     at invalid-patches.asm(8)

test/link/ldh-bad.out

@@ -1,3 +1,3 @@
-error: Address $1234 for LDH is not in HRAM range
+error: Address $1234 for LDH is not in HRAM range; use LD instead
     at ldh-bad.asm(2)
 Linking failed with 1 error

test/link/rst-bad.out

@@ -1,3 +1,3 @@
-error: Value $1 is not a RST vector
+error: Value $1 is not a RST vector; use CALL instead
     at rst-bad.asm(2)
 Linking failed with 1 error